Timeline for How will Bennu's volatile compounds stay cool and unmodified by the heat of re-entry (OSIRIS-REx)?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Sep 10, 2016 at 17:56 | history | edited | Nathan Tuggy | CC BY-SA 3.0 |
Fixed spelling/grammar, tweaked markdown, improved link.
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| Sep 10, 2016 at 17:24 | answer | added | Innovine | timeline score: -2 | |
| Sep 9, 2016 at 1:20 | comment | added | uhoh | @RussellBorogove yep, thus the cautious wording "If it gets hotter than it does while on Bennu, the science may be compromised." Ballparking: $T^4 = TSI_{max} / \sigma \epsilon$ where $TSI_{max} = 1368/ 0.9AU^2 \ W/m^2 $, $\epsilon \approx 0.96$ and $\sigma \approx 5.67x10^{-8} \ W/m^2K^4$ gives about 420K or 150C, but material down a few cm may never get nearly that hot since the packing will be very loose in low gravity making thermal conductivity quite low. Since temperatures associated with reentry are of order 3000K for say 100 sec, the capsule is quite a feat of engineering! | |
| Sep 8, 2016 at 23:25 | comment | added | Russell Borogove | Bear in mind that the asteroid is revolving, with its surface in direct sunlight for half of its 4.3 hour rotation period. Depending on latitude, the collected surface sample may have already cycled many times between -100 and +100 degrees C. | |
| Sep 8, 2016 at 14:19 | history | tweeted | twitter.com/StackSpaceExp/status/773888562655887360 | ||
| Sep 8, 2016 at 12:33 | answer | added | uhoh | timeline score: 2 | |
| Sep 8, 2016 at 12:23 | vote | accept | uhoh | ||
| Sep 8, 2016 at 11:30 | answer | added | Hobbes | timeline score: 10 | |
| Sep 8, 2016 at 4:20 | answer | added | ViennaCodex | timeline score: 1 | |
| S Sep 8, 2016 at 4:15 | history | edited | SE - stop firing the good guys | CC BY-SA 3.0 |
minor misspelling of organic++
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| S Sep 8, 2016 at 4:15 | history | suggested | ViennaCodex | CC BY-SA 3.0 |
minor misspelling of organic had to add a couple things to get around the 6 char edit limit
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| Sep 8, 2016 at 3:47 | review | Suggested edits | |||
| S Sep 8, 2016 at 4:15 | |||||
| Sep 8, 2016 at 3:33 | history | edited | uhoh | CC BY-SA 3.0 |
added 222 characters in body
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| Sep 8, 2016 at 3:27 | history | asked | uhoh | CC BY-SA 3.0 |